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BQ25703A: BQ25703A

Maximiliano Libby
Prodigy 200 points
Part Number: BQ25703A

Hello, I assembled two PCB's using baseline of the evaluation board and I am having following issue:

Charger does not provide more than 1600mA to the battery and above that value the inductor starts emitting sound like a buzzer and current register is unstable. My design is a copy of the evaluation board of this device. Please need help to understand what is causing this and hw to fix it. In fact I assembled 2 PCB's and both have same issue (both are set for using 3 cell 10.8V Li-ion battery). Attached is my schematic.

This happened in both PCB's but after a while one of them stopped working even having 12V at VIN or VBUS the device do nothing, charger OK LED does not turn on and I dont have voltages at VREGIN.

Also no I2C comms allowed.

Thank youCHARGER_MODULE_FOR_PWR_DIST_REVA.pdf

  • 0
    TI__Genius 11385 points

    Hi,

    Thanks for reaching out.

    There are not a lot of info on your schematic that I can look at (no values for passive components). 

    I would recommend:

    1. Double check your values with the EVM once again.

    2. Refer to the EVM layout. 

    3. Get an EVM to evaluate and compare if you haven't done so already.

    https://www.ti.com/tool/BQ25703AEVM-732 

    Thanks and I hope this helps,

    Peng

    *If my answer solves your question, please press "This Resolved My Issue" on the thread.